According to the Croatian law, at least one person on the vessel must posses valid nautical and VHF licences.
List of valid nautical certificates for bareboat charter in Croatia (PDF).
Charter guide

Itinerary 7-day route

Base info
Turistic tax: Euro only (1,4 €/day/person)
Transit log: cash, Mastercard or Visa
Security deposit: Mastercard, Visa or cash
In a case of accident, Garant Charter issues confirmation and insurance company gives you back the deposit.